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Backend Agent - API & Server Specialist · bilal140202 | DecimalAI

codingby bilal140202

Backend Agent - API & Server Specialist

bilal140202/backend-agent

Source bilal140202/the-lord-of-the-skills ↗License MIT

Backend specialist for APIs, databases, authentication using FastAPI with clean architecture (Repository/Service/Router pattern)

SkillScore77Maintained

Automatic

Coding pack

Last verified 8/8/2026

What it changes

Passed 17 of 22 test cases with the skill, and 12 of 22 without it.

Without skill55%

With skill77%

Checks it passed that the model alone missed

The maximum line length rule is set to 100 characters.
Custom exception classes are defined in src/lib/exceptions.py.
The query execution logic is placed in src/users/repository.py.

and 8 more in the full report

8 fixed9 passed either way2 still failing3 broke

Pass-rate lift: +23 pp
Tokens: +4%
Agent turns: 0%
Response time: -31%

Model gemini-3.6-flashMeasured 8/8/2026v117 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/bilal140202-backend-agent/SKILL.md https://app.decimal.ai/s/bilal140202-backend-agent/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add bilal140202-backend-agent, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/bilal140202-backend-agent/ and pins it in .decimal/skills.lock

decimalai skills add bilal140202-backend-agent

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/bilal140202-backend-agent/SKILL.md https://app.decimal.ai/s/bilal140202-backend-agent/SKILL.md

Raw file: /s/bilal140202-backend-agent/SKILL.md ↗ · machine-readable summary at /s/bilal140202-backend-agent.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 8

Prompt

We need to add an order processing feature to our backend API. Can you write the server code for fetching an order by ID and creating a new order? Provide the full API endpoint layer, the service layer for business logic, and the repository layer for database persistence, ensuring all database operations use async queries and proper custom error handling.

What was checked, without and with the skill
Checked	Without skill	With skill
The dependency injection function get_order_service is defined as async def.	Missed	Passed
The files are located within domain module paths such as src/orders/router.py and src/orders/service.py rather than root level files.	Missed	Passed
Error handling uses custom exceptions from src/lib/exceptions.py rather than raw HTTPException in router handlers.	Missed	Passed

case-02 · gemini-3.6-flash · 8/8/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md102 linessingle file

Backend Agent - API & Server Specialist

When to use

Building REST APIs or GraphQL endpoints
Database design and migrations
Authentication and authorization
Server-side business logic
Background jobs and queues

When NOT to use

Frontend UI -> use Frontend Agent
Mobile-specific code -> use Mobile Agent

Core Rules

DRY (Don't Repeat Yourself): Business logic in Service, data access logic in Repository
SOLID:
- Single Responsibility: Classes and functions should have one responsibility
- Dependency Inversion: Use FastAPI's Depends for dependency injection
KISS: Keep it simple and clear

Architecture Pattern

Router (HTTP) → Service (Business Logic) → Repository (Data Access) → Models

Repository Layer

File: src/[domain]/repository.py
Role: Encapsulate DB CRUD and query logic
Principle: No business logic, return SQLAlchemy models

Service Layer

File: src/[domain]/service.py
Role: Business logic, Repository composition, external API calls
Principle: Business decisions only here

Router Layer

File: src/[domain]/router.py
Role: Receive HTTP requests, input validation, call Service, return response

Track record

Benchmark

17 / 22

test cases passed, vs 12 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/2/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

bilal140202 / the-lord-of-the-skills

skills/gondor/claude-code/SSSTAiNLESSS__AntiGravity-Launchpad/SKILL.md

View on GitHub ↗

License MITImported 8/2/2026Version v1

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first-fluke/oma-backendBackend specialist for APIs, databases, authentication with clean architecture (Repository/Service/Router pattern). Use for API, endpoint, REST, database, server, migration, and auth work.Close match+9 pp pass-rate lift

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See it in action

What's inside

Backend Agent - API & Server Specialist

When to use

When NOT to use

Core Rules

Architecture Pattern

Repository Layer

Service Layer

Router Layer

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

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